:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --text: #151a1f;
  --muted: #64717f;
  --line: #dce3ea;
  --accent: #0f8b8d;
  --accent-2: #c75000;
  --ok: #137a3b;
  --warn: #a25d00;
  --bad: #ba2d2d;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

button {
  border: 1px solid transparent;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  min-height: 40px;
  padding: 0 16px;
}

button:hover {
  filter: brightness(0.95);
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
}

.topbar {
  align-items: center;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  padding: 22px clamp(16px, 4vw, 48px);
}

.eyebrow {
  color: var(--accent-2);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 6px;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.08;
}

h2 {
  font-size: 18px;
  line-height: 1.2;
}

main {
  padding: 24px clamp(16px, 4vw, 48px) 48px;
}

.summary {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 20px;
}

.summary article,
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.summary article {
  min-width: 0;
  padding: 16px;
}

.summary span,
.panel-head p,
.row small,
.field span {
  color: var(--muted);
}

.summary strong {
  display: block;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.2;
  margin: 8px 0 4px;
  white-space: nowrap;
}

#ipv6Status {
  font-size: clamp(13px, 1vw, 15px);
  overflow-wrap: anywhere;
  white-space: normal;
}

.summary small {
  display: block;
  min-height: 18px;
  overflow-wrap: anywhere;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.span-2 {
  grid-column: span 2;
}

.panel {
  min-width: 0;
  padding: 18px;
}

.panel-head {
  align-items: start;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 14px;
}

.identity {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.field {
  background: var(--surface-2);
  border-radius: 7px;
  min-height: 72px;
  padding: 12px;
}

.field span {
  display: block;
  font-size: 12px;
  margin-bottom: 7px;
}

.field strong {
  display: block;
  font-size: 15px;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.checks,
.browser-grid {
  display: grid;
  gap: 10px;
}

.browser-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.row {
  align-items: center;
  background: var(--surface-2);
  border-left: 5px solid transparent;
  border-radius: 7px;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  min-height: 58px;
  overflow: hidden;
  padding: 11px 12px;
}

.row-fast::before,
.row-medium::before,
.row-warn::before,
.row-slow::before,
.row-bad::before {
  border-radius: 999px;
  content: "";
  flex: 0 0 10px;
  height: 10px;
}

.row > div {
  flex: 1 1 auto;
  min-width: 0;
  text-align: left;
}

.row strong,
.row small {
  display: block;
  overflow-wrap: anywhere;
}

.row span {
  border-radius: 999px;
  color: #fff;
  flex: 0 0 auto;
  font-size: 12px;
  font-weight: 800;
  min-width: 58px;
  padding: 5px 8px;
  text-align: center;
}

.tag-ok {
  background: var(--ok);
}

.tag-warn {
  background: var(--warn);
}

.tag-bad {
  background: var(--bad);
}

.tag-slow {
  background: var(--accent-2);
}

.tag-info {
  background: #4d6478;
}

.row-fast {
  background: #eef8f2;
  border-left-color: var(--ok);
}

.row-fast::before,
.row-fast > span {
  background: var(--ok);
}

.row-medium,
.row-warn {
  background: #fff7e3;
  border-left-color: var(--warn);
}

.row-medium::before,
.row-medium > span,
.row-warn::before,
.row-warn > span {
  background: var(--warn);
}

.row-slow {
  background: #fff1e8;
  border-left-color: var(--accent-2);
}

.row-slow::before,
.row-slow > span {
  background: var(--accent-2);
}

.row-bad {
  background: #fff0f0;
  border-left-color: var(--bad);
}

.row-bad::before,
.row-bad > span {
  background: var(--bad);
}

.lookup {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 20px;
  padding: 18px;
}

.lookup-form {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.lookup-form input {
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--text);
  flex: 1;
  font: inherit;
  min-height: 40px;
  min-width: 0;
  padding: 0 12px;
}

.lookup-result {
  margin-top: 12px;
}

.site-footer-brand {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  margin-top: 28px;
  text-align: center;
}

@media (max-width: 960px) {
  .summary,
  .grid,
  .identity,
  .browser-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .topbar,
  .lookup-form,
  .panel-head,
  .row {
    align-items: stretch;
    flex-direction: column;
  }

  .row-fast::before,
  .row-medium::before,
  .row-warn::before,
  .row-slow::before,
  .row-bad::before {
    display: none;
  }

  .summary,
  .grid,
  .identity,
  .browser-grid {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: auto;
  }

  .summary strong {
    font-size: clamp(18px, 5vw, 24px);
  }

  #ipv6Status {
    font-size: clamp(14px, 4vw, 16px);
  }
}